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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en">
<head>
<title>What is Pyke?</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<link rel="stylesheet" href="../stylesheets/pyke.css" type="text/css" />
</head>
<body>
<table id="page-table">
<thead class="head">
<tr id="header1"><th id="header" colspan="3">
&nbsp;
</th></tr>
<tr id="header2">
<th id="crumb-left"></th>
<th id="crumb-line">
<div id="nav">
<ul>
<li><a href="../index.html">Home</a></li>
<li>&gt;</li>
<li><a href="index.html">About Pyke</a></li>
<li>&gt;</li>
<li>What is Pyke?</li>
</ul>
</div>
</th>
<th id="crumb-right"></th>
</tr>
</thead>
<tbody id="body">
<tr id="body-tr">
<td id="left-nav">
<div id="left-nav-div">
<div class="title-nav"><a href="../index.html">Home</a></div><div class="nav-branch">
<div class="title-nav"><a href="index.html">About Pyke</a></div><div class="nav-branch">
<div class="normal-nav"><a href="cooking_functions.html">Cooking Functions</a></div>
<div class="normal-nav"><a href="what_is_pyke.html">What is Pyke?</a></div>
<div class="normal-nav"><a href="steps_to_using_pyke.html">Steps to Using Pyke</a></div>
<div class="normal-nav"><a href="installing_pyke.html">Installing Pyke</a></div>
<div class="normal-nav"><a href="modifying_pyke.html">Modifying Pyke</a></div>
</div>
<div class="normal-nav"><a href="../logic_programming/index.html">Logic Programming</a></div>
<div class="normal-nav"><a href="../knowledge_bases/index.html">Knowledge Bases</a></div>
<div class="normal-nav"><a href="../pyke_syntax/index.html">Pyke Syntax</a></div>
<div class="normal-nav"><a href="../using_pyke/index.html">Using Pyke</a></div>
<div class="normal-nav"><a href="../examples.html">Examples</a></div>
<div class="normal-nav"><a href="../PyCon2008-paper.html">PyCon 2008 Paper</a></div>
</div>
</div>
<div id="icons">
<div id="project-page">
<a href="http://sourceforge.net/projects/pyke/">Pyke Project Page</a>
</div>
Please Make a Donation:<br />
<a href="http://sourceforge.net/donate/index.php?group_id=207724">
<img src="http://images.sourceforge.net/images/project-support.jpg"
width="88" height="32" border="0"
alt="Support This Project" /> </a> <br /><br />
Hosted by: <br />
<a href="http://sourceforge.net/projects/pyke">
<img src="http://sflogo.sourceforge.net/sflogo.php?group_id=207724&amp;type=14"
width="150" height="40"
alt="Get Python Knowledge Engine (PyKE) at SourceForge.net. Fast, secure and Free Open Source software downloads" /></a>
</div>
</td>
<td id="main-td">
<div id="main">
<a name="startcontent" id="startcontent"></a>
<div class="document" id="what-is-pyke">
<h1 class="title">What is Pyke?</h1>
<p>Pyke integrates a form of <a class="reference external" href="http://en.wikipedia.org/wiki/Logic_programming">Logic Programming</a> into Python by providing a
knowledge engine that can:</p>
<ul class="simple">
<li>Do both forward-chaining (data driven) and
backward-chaining (goal directed) inferencing.<ul>
<li>Pyke may be embedded into any Python program.</li>
</ul>
</li>
<li>Automatically generate Python programs by assembling individual Python
functions into complete call graphs.<ul>
<li>This is done through a unique design where the individual Python
functions are attached to backward-chaining rules.</li>
<li>Unlike other approaches to code reuse (e.g. Object-oriented programming,
Zope adapters, generic functions), this allows the inference engine to
ensure that all of the function's requirements are completely satisfied,
by examining the entire call graph down to the leaves, before <strong>any</strong> of
the functions are executed.</li>
<li>This is an optional feature. You don't need to use it if you just
want the inferencing capability by itself.</li>
</ul>
</li>
</ul>
<div class="section" id="the-knowledge-engine-supports">
<h2>The Knowledge Engine Supports:</h2>
<ul class="simple">
<li>Multiple <em>fact bases</em>, each with its own list of facts.</li>
<li>Both <em>forward-chaining</em> rules and <em>backward-chaining</em> rules.</li>
<li>Multiple <em>rule bases</em>, each with its own list of forward-chaining
and/or backward-chaining rules.</li>
<li>Rule base inheritance -- <em>activating</em> the derived rule base
includes the rules from the parent rule base.</li>
<li>The inference rules are compiled into Python functions, allowing
Python code snippets to be used within the rules.
This greatly enhances the expressiveness of the rules.</li>
</ul>
</div>
<div class="section" id="automatic-program-generation">
<h2>Automatic Program Generation:</h2>
<ul class="simple">
<li>Calls the generated Python programs <em>plans</em>.</li>
<li>Plans may be run multiple times without needing to rerun the inference
rules.</li>
<li>Plans may be pickled and cached to disk to be used by other programs or
in later runs of the same program.</li>
<li>Only one small Pyke module is required to run the plans.</li>
</ul>
</div>
<div class="section" id="potential-pyke-applications">
<h2>Potential Pyke Applications:</h2>
<ul class="simple">
<li>Complicated decision making applications.</li>
<li>The back-end (code generation and optimization) of compilers.
Pyke is used as the back-end of its own
compiler that translates rules into Python code.</li>
<li>Automatic SQL statement generation.</li>
<li>Automatic HTML generation and automatic HTML template processing.</li>
<li>Automatic program builder to reuse a common set of functions for many
different specific situations. This could also easily
incorporate a new custom function into a much larger program, where the use
of the custom function might influence the choice of other standard
functions in other parts of the program.</li>
<li>The control module for a web framework tool.</li>
<li>A high-level planner to automatically distribute the
modules of a large system over several computers in a distributed system
to meet specific performance and capacity goals. This could be used to
automatically scale the same system code from a small one program,
one computer system
to much larger distributed systems to meet a wide range of performance
goals.</li>
<li>Diagnosis systems, including automated customer service systems.</li>
<li>Program or library customization for specific uses.</li>
<li>In addition to being able to build programs, Pyke can instantiate,
configure and interconnect a network of objects to meet a specific need
or situation.</li>
</ul>
<!-- ADD_LINKS MARKER -->
</div>
</div>
<!-- <div id="return-to-top">
<a href="#">Return to Top</a>
</div>
-->
</div>
</td>
<td id="right-nav">
<div id="right-nav-div">
<h3>More:</h3>
<div class="right-item"><a href="cooking_functions.html">Cooking Python Functions</a><p>Explanation of how Pyke &quot;cooks&quot; Python functions.</p>
</div>
<div class="right-item"><a href="what_is_pyke.html">What is Pyke?</a><p>An overview of Pyke's features.</p>
</div>
<div class="right-item"><a href="steps_to_using_pyke.html">Steps to Using Pyke</a><p>A brief list of the steps involved in programming in Pyke (with lots
of links).</p>
</div>
<div class="right-item"><a href="installing_pyke.html">Installing Pyke</a><p>System Requirements and installing Pyke.</p>
</div>
<div class="right-item"><a href="modifying_pyke.html">Modifying Pyke</a><p>Which source code repository to use. And the other tools that you'll
need run the units tests, and rebuild the html documentation.</p>
</div>
</div>
</td>
</tr>
</tbody>
<tfoot id="foot">
<tr id="foot2">
<td id="copyright" colspan="3">
Copyright &copy; 2007-2009 Bruce Frederiksen
</td>
</tr>
</tfoot>
</table>
<div id="last-modified">
Page last modified
Mon, Oct 27 2008.
</div>
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